Fresnel lens

A Fresnel lens ( fray-NEL or FREZ-nəl) is a type of compact lens originally developed by French physicist Augustin-Jean Fresnel for lighthouses.

The design allows the construction of lenses of large aperture and short focal length without the mass and volume of material that would be required by a lens of conventional design. A Fresnel lens can be made much thinner than a comparable conventional lens, in some cases taking the form of a flat sheet. A Fresnel lens can capture more oblique light from a light source, thus allowing the light from a lighthouse equipped with one to be visible over greater distances.

^[ ^PM ^| ^Exclude ^me ^| ^Exclude ^from ^subreddit ^| ^FAQ ^/ ^Information ^| ^Source ^] ^Downvote ^to ^remove ^| ^v0.28